In reply to elfears:
If you're going to be living in a tent for three months continually, then I suspect there are three considerations worth paying more for; roominess, stability and weatherproofing.
With that in mind, and also since you haven't given a budget, you might want to look at either a MacPac Olympus - a two man tunnel tent, but well guyed and with the ability to be double poled which you really shouldn't need - or a Quasar, or similar design (Vango have a number).
If budget is a key consideration, don't rule out looking on ebay, or similar. A good 'un in good condition used is still a good 'un.
T.